Zhou Yang, Tong Xin, Pang Ning, Deng Yanping, Yan Chenhuan, Wu Dajun, Xu Shaohui, Xiong Dayuan, Wang Lianwei, Chu Paul K
Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, P.R. China.
Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
ACS Appl Mater Interfaces. 2021 Jul 28;13(29):34292-34300. doi: 10.1021/acsami.1c08108. Epub 2021 Jul 14.
Flexible rechargeable Zn//Ni batteries are attractive owing to their high energy density, good safety, inexpensive cost, and simple manufacturing process. However, the effects of metal doping on the properties of NiS cathodes in Zn/Ni batteries are not well understood. Herein, a binder-free NiS electrode is doped with Zn and Co and the nanocomposite structures are prepared on nickel foam (named ZCNS/NF) by a simple two-step hydrothermal technique. The ZCNS/NF//Zn battery delivers excellent electrochemical performance such as a working voltage window can be as high as 2.05 V, a capacity of 2.3 mAh cm at 12 mA cm, and 82% retention going through 2000 cycles at 20 mA cm. The battery has a maximum output area energy density of 1.8 mWh cm (462 Wh kg) and a power density of 36.8 mW cm (9.2 kW kg). In addition, the flexible battery remains operational while being bent at a large angle and even punctured. The high performance and robustness of the composite cathode suggest that the design principle and materials have large commercial potential in Ni//Zn batteries.
柔性可充电锌镍电池因其高能量密度、良好的安全性、低成本以及简单的制造工艺而备受关注。然而，金属掺杂对锌镍电池中硫化镍阴极性能的影响尚未得到充分理解。在此，通过一种简单的两步水热技术，在泡沫镍上制备了一种无粘结剂的硫化镍电极，并对其进行锌和钴的掺杂，形成纳米复合结构（命名为ZCNS/NF）。ZCNS/NF//Zn电池具有优异的电化学性能，例如工作电压窗口高达2.05V，在12mA/cm²时容量为2.3mAh/cm²，在20mA/cm²下经过2000次循环后容量保持率为82%。该电池的最大输出面积能量密度为1.8mWh/cm²（462Wh/kg），功率密度为36.8mW/cm²（9.2kW/kg）。此外，该柔性电池在大角度弯曲甚至被刺穿时仍能保持工作。复合阴极的高性能和稳健性表明，该设计原理和材料在镍锌电池中具有巨大的商业潜力。
